The average rate of a hedging instrument. [Refer: Hedging instruments [member]]

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The interest rate on borrowings. [Refer: Borrowings]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The description of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The description of the type of a hedge used by the entity.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities]

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The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]]

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Description of Hedgeinstrument maturity

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Nominal amounts of hedging instrument.

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Financial risk management and derivative financial instruments - Disclosure of Detailed Information About Hedging Instruments (Detail) £ in Millions, Euro in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) GBP (£) Euro	Dec. 31, 2022 USD ($)
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Fair value \| $	$ (14)	$ 48
Cash flow hedge of November 2018 [Member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Maturity	May 2027
Hedging instrument-Risk	Foreign exchange
Hedging instrument-Type	Cash flow
Hedging instrument-Hedged item	€500m 2.125% bonds 2027
Cash flow hedge of November 2018 [Member] \| Pay Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Payleg \| £	436
Cash flow hedge of November 2018 [Member] \| Pay Hedging Instrument [member] \| Fixed interest rate [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Interest rate	3.50%
Cash flow hedge of November 2018 [Member] \| Receive Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Receive leg \| Euro	500
Cash flow hedge of November 2018 [Member] \| Receive Hedging Instrument [member] \| Fixed interest rate [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Interest rate	2.125%
Cash flow hedge of October 2020 [Member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Maturity	October 2024
Hedging instrument-Risk	Foreign exchange
Hedging instrument-Type	Cash flow
Hedging instrument-Hedged item	€500m 1.625% bonds 2024
Cash flow hedge of October 2020 [Member] \| Pay Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Payleg \| £	454
Cash flow hedge of October 2020 [Member] \| Pay Hedging Instrument [member] \| Fixed interest rate [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Interest rate	2.70%
Cash flow hedge of October 2020 [Member] \| Receive Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Receive leg \| Euro	500
Cash flow hedge of October 2020 [Member] \| Receive Hedging Instrument [member] \| Fixed interest rate [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Interest rate	1.625%
Cash flow hedge of November 2023 [Member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Maturity	November 2029
Hedging instrument-Risk	Foreign exchange
Hedging instrument-Type	Cash flow
Hedging instrument-Hedged item	€600m 4.375% bonds 2029
Cash flow hedge of November 2023 [Member] \| Pay Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Payleg \| $	657
Cash flow hedge of November 2023 [Member] \| Pay Hedging Instrument [member] \| Fixed interest rate [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Interest rate	6.00%
Cash flow hedge of November 2023 [Member] \| Receive Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Receive leg \| Euro	600
Cash flow hedge of November 2023 [Member] \| Receive Hedging Instrument [member] \| Fixed interest rate [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Interest rate	4.375%
Net investment hedge of October 2023 [Member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Maturity	October 2028
Hedging instrument-Risk	Spot foreign exchange
Hedging instrument-Type	Net investment
Hedging instrument-Hedged item	Net assets of specified subsidiaries with US dollar foreign currency
Net investment hedge of October 2023 [Member] \| Pay Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Payleg \| $	425
Net investment hedge of October 2023 [Member] \| Receive Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Receive leg \| £	344